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<div class="title">samples/cpp/camshiftdemo.cpp</div>  </div>
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<p>An example using the mean-shift tracking algorithm</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4e/utility_8hpp.html">opencv2/core/utility.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dc2/modules_2video_2include_2opencv2_2video_2tracking_8hpp.html">opencv2/video/tracking.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../dc/d3d/videoio_8hpp.html">opencv2/videoio.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;ctype.h&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> image;</div><div class="line"></div><div class="line"><span class="keywordtype">bool</span> backprojMode = <span class="keyword">false</span>;</div><div class="line"><span class="keywordtype">bool</span> selectObject = <span class="keyword">false</span>;</div><div class="line"><span class="keywordtype">int</span> trackObject = 0;</div><div class="line"><span class="keywordtype">bool</span> showHist = <span class="keyword">true</span>;</div><div class="line"><a name="_a1"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> origin;</div><div class="line"><a name="_a2"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html">Rect</a> selection;</div><div class="line"><span class="keywordtype">int</span> vmin = 10, vmax = 256, smin = 30;</div><div class="line"></div><div class="line"><span class="comment">// User draws box around object to track. This triggers CAMShift to start tracking</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> onMouse( <span class="keywordtype">int</span> event, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y, <span class="keywordtype">int</span>, <span class="keywordtype">void</span>* )</div><div class="line">{</div><div class="line">    <span class="keywordflow">if</span>( selectObject )</div><div class="line">    {</div><div class="line">        selection.<a name="a3"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a2cadfdc3b4b7dbf8085622b27e044572">x</a> = <a name="a4"></a><a class="code" href="../../db/de0/group__core__utils.html#ga3acffbd305ee72dcd4593c0d8af64a4f">MIN</a>(x, origin.<a name="a5"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>);</div><div class="line">        selection.<a name="a6"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6a4860e984df1752623b6ce2a8bde73a">y</a> = <a class="code" href="../../db/de0/group__core__utils.html#ga3acffbd305ee72dcd4593c0d8af64a4f">MIN</a>(y, origin.<a name="a7"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>);</div><div class="line">        selection.<a name="a8"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a> = <a name="a9"></a><a class="code" href="../../d2/d75/namespacecv.html#af6df65b17fb11af6d34634b6dfa44683">std::abs</a>(x - origin.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>);</div><div class="line">        selection.<a name="a10"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a> = <a class="code" href="../../d2/d75/namespacecv.html#af6df65b17fb11af6d34634b6dfa44683">std::abs</a>(y - origin.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>);</div><div class="line"></div><div class="line">        selection &amp;= <a name="a11"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga11d95de507098e90bad732b9345402e8">Rect</a>(0, 0, image.<a name="a12"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a>, image.<a name="a13"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a>);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">switch</span>( event )</div><div class="line">    {</div><div class="line">    <span class="keywordflow">case</span> <a name="a14"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0ad3419100fc2d7688c6dbe3da030fbfd9">EVENT_LBUTTONDOWN</a>:</div><div class="line">        origin = <a name="a15"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(x,y);</div><div class="line">        selection = <a class="code" href="../../dc/d84/group__core__basic.html#ga11d95de507098e90bad732b9345402e8">Rect</a>(x,y,0,0);</div><div class="line">        selectObject = <span class="keyword">true</span>;</div><div class="line">        <span class="keywordflow">break</span>;</div><div class="line">    <span class="keywordflow">case</span> <a name="a16"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0a59cad7ffe959adf2782a110196d47bf6">EVENT_LBUTTONUP</a>:</div><div class="line">        selectObject = <span class="keyword">false</span>;</div><div class="line">        <span class="keywordflow">if</span>( selection.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a> &gt; 0 &amp;&amp; selection.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a> &gt; 0 )</div><div class="line">            trackObject = -1;   <span class="comment">// Set up CAMShift properties in main() loop</span></div><div class="line">        <span class="keywordflow">break</span>;</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">string</span> hot_keys =</div><div class="line">    <span class="stringliteral">&quot;\n\nHot keys: \n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;\tESC - quit the program\n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;\tc - stop the tracking\n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;\tb - switch to/from backprojection view\n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;\th - show/hide object histogram\n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;\tp - pause video\n&quot;</span></div><div class="line">    <span class="stringliteral">&quot;To initialize tracking, select the object with mouse\n&quot;</span>;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> help(<span class="keyword">const</span> <span class="keywordtype">char</span>** argv)</div><div class="line">{</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;\nThis is a demo that shows mean-shift based tracking\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;You select a color objects such as your face and it tracks it.\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;This reads from video camera (0 by default, or the camera number the user enters\n&quot;</span></div><div class="line">            <span class="stringliteral">&quot;Usage: \n\t&quot;</span>;</div><div class="line">    cout &lt;&lt; argv[0] &lt;&lt; <span class="stringliteral">&quot; [camera number]\n&quot;</span>;</div><div class="line">    cout &lt;&lt; hot_keys;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* keys =</div><div class="line">{</div><div class="line">    <span class="stringliteral">&quot;{help h | | show help message}{@camera_number| 0 | camera number}&quot;</span></div><div class="line">};</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> argc, <span class="keyword">const</span> <span class="keywordtype">char</span>** argv )</div><div class="line">{</div><div class="line">    <a name="_a17"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html">VideoCapture</a> cap;</div><div class="line">    <a class="code" href="../../d2/d44/classcv_1_1Rect__.html">Rect</a> trackWindow;</div><div class="line">    <span class="keywordtype">int</span> hsize = 16;</div><div class="line">    <span class="keywordtype">float</span> hranges[] = {0,180};</div><div class="line">    <span class="keyword">const</span> <span class="keywordtype">float</span>* phranges = hranges;</div><div class="line">    <a name="_a18"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">CommandLineParser</a> parser(argc, argv, keys);</div><div class="line">    <span class="keywordflow">if</span> (parser.<a name="a19"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;help&quot;</span>))</div><div class="line">    {</div><div class="line">        help(argv);</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    }</div><div class="line">    <span class="keywordtype">int</span> camNum = parser.<a name="a20"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">int</span>&gt;(0);</div><div class="line">    cap.<a name="a21"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a614a1702e15f42ede5100014ce7f48ed">open</a>(camNum);</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>( !cap.<a name="a22"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a9d2ca36789e7fcfe7a7be3b328038585">isOpened</a>() )</div><div class="line">    {</div><div class="line">        help(argv);</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;***Could not initialize capturing...***\n&quot;</span>;</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Current parameter&#39;s value: \n&quot;</span>;</div><div class="line">        parser.<a name="a23"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a84cda3794b765332bfe43bf8367222fb">printMessage</a>();</div><div class="line">        <span class="keywordflow">return</span> -1;</div><div class="line">    }</div><div class="line">    cout &lt;&lt; hot_keys;</div><div class="line">    <a name="a24"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( <span class="stringliteral">&quot;Histogram&quot;</span>, 0 );</div><div class="line">    <a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( <span class="stringliteral">&quot;CamShift Demo&quot;</span>, 0 );</div><div class="line">    <a name="a25"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga89e7806b0a616f6f1d502bd8c183ad3e">setMouseCallback</a>( <span class="stringliteral">&quot;CamShift Demo&quot;</span>, onMouse, 0 );</div><div class="line">    <a name="a26"></a><a class="code" href="../../d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b">createTrackbar</a>( <span class="stringliteral">&quot;Vmin&quot;</span>, <span class="stringliteral">&quot;CamShift Demo&quot;</span>, &amp;vmin, 256, 0 );</div><div class="line">    <a class="code" href="../../d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b">createTrackbar</a>( <span class="stringliteral">&quot;Vmax&quot;</span>, <span class="stringliteral">&quot;CamShift Demo&quot;</span>, &amp;vmax, 256, 0 );</div><div class="line">    <a class="code" href="../../d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b">createTrackbar</a>( <span class="stringliteral">&quot;Smin&quot;</span>, <span class="stringliteral">&quot;CamShift Demo&quot;</span>, &amp;smin, 256, 0 );</div><div class="line"></div><div class="line">    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> frame, hsv, hue, <a name="a27"></a><a class="code" href="../../da/dd3/group__gapi__math.html#gaba076d51941328cb7ca9348b7b535220">mask</a>, hist, histimg = <a name="a28"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a0b57b6a326c8876d944d188a46e0f556">Mat::zeros</a>(200, 320, <a name="a29"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>), backproj;</div><div class="line">    <span class="keywordtype">bool</span> paused = <span class="keyword">false</span>;</div><div class="line"></div><div class="line">    <span class="keywordflow">for</span>(;;)</div><div class="line">    {</div><div class="line">        <span class="keywordflow">if</span>( !paused )</div><div class="line">        {</div><div class="line">            cap &gt;&gt; frame;</div><div class="line">            <span class="keywordflow">if</span>( frame.empty() )</div><div class="line">                <span class="keywordflow">break</span>;</div><div class="line">        }</div><div class="line"></div><div class="line">        frame.<a name="a30"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a33fd5d125b4c302b0c9aa86980791a77">copyTo</a>(image);</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( !paused )</div><div class="line">        {</div><div class="line">            <a name="a31"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#ga397ae87e1288a81d2363b61574eb8cab">cvtColor</a>(image, hsv, <a name="a32"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0aa4a7f0ecf2e94150699e48c79139ee12">COLOR_BGR2HSV</a>);</div><div class="line"></div><div class="line">            <span class="keywordflow">if</span>( trackObject )</div><div class="line">            {</div><div class="line">                <span class="keywordtype">int</span> _vmin = vmin, _vmax = vmax;</div><div class="line"></div><div class="line">                <a name="a33"></a><a class="code" href="../../d2/de8/group__core__array.html#ga48af0ab51e36436c5d04340e036ce981">inRange</a>(hsv, <a name="a34"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, smin, <a class="code" href="../../db/de0/group__core__utils.html#ga3acffbd305ee72dcd4593c0d8af64a4f">MIN</a>(_vmin,_vmax)),</div><div class="line">                        <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(180, 256, <a name="a35"></a><a class="code" href="../../db/de0/group__core__utils.html#gafa99ec4acc4ecb2dc3c2d05da15d0e3f">MAX</a>(_vmin, _vmax)), mask);</div><div class="line">                <span class="keywordtype">int</span> ch[] = {0, 0};</div><div class="line">                hue.<a name="a36"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a55ced2c8d844d683ea9a725c60037ad0">create</a>(hsv.<a name="a37"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a146f8e8dda07d1365a575ab83d9828d1">size</a>(), hsv.<a name="a38"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a8da9f853b6f3a29d738572fd1ffc44c0">depth</a>());</div><div class="line">                <a name="a39"></a><a class="code" href="../../d2/de8/group__core__array.html#ga51d768c270a1cdd3497255017c4504be">mixChannels</a>(&amp;hsv, 1, &amp;hue, 1, ch, 1);</div><div class="line"></div><div class="line">                <span class="keywordflow">if</span>( trackObject &lt; 0 )</div><div class="line">                {</div><div class="line">                    <span class="comment">// Object has been selected by user, set up CAMShift search properties once</span></div><div class="line">                    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> roi(hue, selection), maskroi(mask, selection);</div><div class="line">                    <a name="a40"></a><a class="code" href="../../d6/dc7/group__imgproc__hist.html#ga4b2b5fd75503ff9e6844cc4dcdaed35d">calcHist</a>(&amp;roi, 1, 0, maskroi, hist, 1, &amp;hsize, &amp;phranges);</div><div class="line">                    <a name="a41"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1b6a396a456c8b6c6e4afd8591560d80">normalize</a>(hist, hist, 0, 255, <a name="a42"></a><a class="code" href="../../d2/de8/group__core__array.html#ggad12cefbcb5291cf958a85b4b67b6149fa9f0c1c342a18114d47b516a88e29822e">NORM_MINMAX</a>);</div><div class="line"></div><div class="line">                    trackWindow = selection;</div><div class="line">                    trackObject = 1; <span class="comment">// Don&#39;t set up again, unless user selects new ROI</span></div><div class="line"></div><div class="line">                    histimg = <a name="a43"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line">                    <span class="keywordtype">int</span> binW = histimg.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> / hsize;</div><div class="line">                    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> buf(1, hsize, <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>);</div><div class="line">                    <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0; i &lt; hsize; i++ )</div><div class="line">                        buf.<a name="a44"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa5d20fc86d41d59e4d71ae93daee9726">at</a>&lt;<a name="_a45"></a><a class="code" href="../../d6/dcf/classcv_1_1Vec.html">Vec3b</a>&gt;(i) = <a name="a46"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga7e6060c0b8d48459964df6e1eb524c03">Vec3b</a>(<a name="a47"></a><a class="code" href="../../db/de0/group__core__utils.html#ga2858f5fe522e46a2e17662669199f6ff">saturate_cast&lt;uchar&gt;</a>(i*180./hsize), 255, 255);</div><div class="line">                    <a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#ga397ae87e1288a81d2363b61574eb8cab">cvtColor</a>(buf, buf, <a name="a48"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0a2a4b11ff7d29c342b66b85962a7969cd">COLOR_HSV2BGR</a>);</div><div class="line"></div><div class="line">                    <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0; i &lt; hsize; i++ )</div><div class="line">                    {</div><div class="line">                        <span class="keywordtype">int</span> val = <a name="a49"></a><a class="code" href="../../db/de0/group__core__utils.html#gab93126370b85fda2c8bfaf8c811faeaf">saturate_cast</a>&lt;<span class="keywordtype">int</span>&gt;(hist.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa5d20fc86d41d59e4d71ae93daee9726">at</a>&lt;<span class="keywordtype">float</span>&gt;(i)*histimg.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a>/255);</div><div class="line">                        <a name="a50"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( histimg, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(i*binW,histimg.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a>),</div><div class="line">                                   <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a>((i+1)*binW,histimg.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> - val),</div><div class="line">                                   <a name="_a51"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html">Scalar</a>(buf.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa5d20fc86d41d59e4d71ae93daee9726">at</a>&lt;<a class="code" href="../../d6/dcf/classcv_1_1Vec.html">Vec3b</a>&gt;(i)), -1, 8 );</div><div class="line">                    }</div><div class="line">                }</div><div class="line"></div><div class="line">                <span class="comment">// Perform CAMShift</span></div><div class="line">                <a name="a52"></a><a class="code" href="../../d6/dc7/group__imgproc__hist.html#ga3a0af640716b456c3d14af8aee12e3ca">calcBackProject</a>(&amp;hue, 1, 0, hist, backproj, &amp;phranges);</div><div class="line">                backproj &amp;= <a class="code" href="../../da/dd3/group__gapi__math.html#gaba076d51941328cb7ca9348b7b535220">mask</a>;</div><div class="line">                <a name="_a53"></a><a class="code" href="../../db/dd6/classcv_1_1RotatedRect.html">RotatedRect</a> trackBox = <a name="a54"></a><a class="code" href="../../dc/d6b/group__video__track.html#gaef2bd39c8356f423124f1fe7c44d54a1">CamShift</a>(backproj, trackWindow,</div><div class="line">                                    <a name="_a55"></a><a class="code" href="../../d9/d5d/classcv_1_1TermCriteria.html">TermCriteria</a>( <a name="a56"></a><a class="code" href="../../d9/d5d/classcv_1_1TermCriteria.html#a56fecdc291ccaba8aad27d67ccf72c57a857609e73e7028e638d2ea649f3b45d5">TermCriteria::EPS</a> | <a name="a57"></a><a class="code" href="../../d9/d5d/classcv_1_1TermCriteria.html#a56fecdc291ccaba8aad27d67ccf72c57aeb9da694ea67b3ef7d524521b580867d">TermCriteria::COUNT</a>, 10, 1 ));</div><div class="line">                <span class="keywordflow">if</span>( trackWindow.<a name="a58"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a0dba3ba97160894da4b8c8b4d8712c8e">area</a>() &lt;= 1 )</div><div class="line">                {</div><div class="line">                    <span class="keywordtype">int</span> cols = backproj.cols, rows = backproj.rows, r = (<a class="code" href="../../db/de0/group__core__utils.html#ga3acffbd305ee72dcd4593c0d8af64a4f">MIN</a>(cols, rows) + 5)/6;</div><div class="line">                    trackWindow = <a class="code" href="../../dc/d84/group__core__basic.html#ga11d95de507098e90bad732b9345402e8">Rect</a>(trackWindow.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a2cadfdc3b4b7dbf8085622b27e044572">x</a> - r, trackWindow.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6a4860e984df1752623b6ce2a8bde73a">y</a> - r,</div><div class="line">                                       trackWindow.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a2cadfdc3b4b7dbf8085622b27e044572">x</a> + r, trackWindow.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6a4860e984df1752623b6ce2a8bde73a">y</a> + r) &amp;</div><div class="line">                                  <a class="code" href="../../dc/d84/group__core__basic.html#ga11d95de507098e90bad732b9345402e8">Rect</a>(0, 0, cols, rows);</div><div class="line">                }</div><div class="line"></div><div class="line">                <span class="keywordflow">if</span>( backprojMode )</div><div class="line">                    <a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#ga397ae87e1288a81d2363b61574eb8cab">cvtColor</a>( backproj, image, <a name="a59"></a><a class="code" href="../../d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0a869da65c045477f2f17d39395df65b2d">COLOR_GRAY2BGR</a> );</div><div class="line">                <a name="a60"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga28b2267d35786f5f890ca167236cbc69">ellipse</a>( image, trackBox, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,0,255), 3, <a name="a61"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a> );</div><div class="line">            }</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>( trackObject &lt; 0 )</div><div class="line">            paused = <span class="keyword">false</span>;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>( selectObject &amp;&amp; selection.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a> &gt; 0 &amp;&amp; selection.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a> &gt; 0 )</div><div class="line">        {</div><div class="line">            <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> roi(image, selection);</div><div class="line">            <a name="a62"></a><a class="code" href="../../d2/de8/group__core__array.html#ga0002cf8b418479f4cb49a75442baee2f">bitwise_not</a>(roi, roi);</div><div class="line">        }</div><div class="line"></div><div class="line">        <a name="a63"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;CamShift Demo&quot;</span>, image );</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;Histogram&quot;</span>, histimg );</div><div class="line"></div><div class="line">        <span class="keywordtype">char</span> c = (char)<a name="a64"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(10);</div><div class="line">        <span class="keywordflow">if</span>( c == 27 )</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        <span class="keywordflow">switch</span>(c)</div><div class="line">        {</div><div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;b&#39;</span>:</div><div class="line">            backprojMode = !backprojMode;</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;c&#39;</span>:</div><div class="line">            trackObject = 0;</div><div class="line">            histimg = <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;h&#39;</span>:</div><div class="line">            showHist = !showHist;</div><div class="line">            <span class="keywordflow">if</span>( !showHist )</div><div class="line">                <a name="a65"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga851ccdd6961022d1d5b4c4f255dbab34">destroyWindow</a>( <span class="stringliteral">&quot;Histogram&quot;</span> );</div><div class="line">            <span class="keywordflow">else</span></div><div class="line">                <a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( <span class="stringliteral">&quot;Histogram&quot;</span>, 1 );</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;p&#39;</span>:</div><div class="line">            paused = !paused;</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        <span class="keywordflow">default</span>:</div><div class="line">            ;</div><div class="line">        }</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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